THRIFT-5949: Add default timeout to Ruby server sockets

[kpumuk]

This change adds a keyword argument client_timeout to all server sockets:

# Default timeout is 5 seconds
socket = Thrift::ServerSocket.new(1234)
# Reduce the server timeout to 2.5 seconds
socket = Thrift::ServerSocket.new(1234, client_timeout: 2.5)
# Pass nil to remove the timeout, reverting to pre-0.24.0 behavior
socket = Thrift::ServerSocket.new(1234, client_timeout: nil)

This is the first time Thrift Ruby library uses keyword arguments. The reason for this is to align with the upcoming switch of all public interfaces to keyword arguments, and better handle optional arguments (so you don't need to pass all other positional args to change the client timeout).

• Did you create an Apache Jira ticket? THRIFT-5949
• If a ticket exists: Does your pull request title follow the pattern "THRIFT-NNNN: describe my issue"?
• Did you squash your changes to a single commit? (not required, but preferred)
• Did you do your best to avoid breaking changes? If one was needed, did you label the Jira ticket with "Breaking-Change"?
• If your change does not involve any code, include [skip ci] anywhere in the commit message to free up build resources.